scholarly journals Musculoskeletal modelling of an ostrich (Struthio camelus) pelvic limb: influence of limb orientation on muscular capacity during locomotion

PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e1001 ◽  
Author(s):  
John R. Hutchinson ◽  
Jeffery W. Rankin ◽  
Jonas Rubenson ◽  
Kate H. Rosenbluth ◽  
Robert A. Siston ◽  
...  
Keyword(s):  
Musculoskeletal Modelling ◽  
Struthio Camelus ◽  
Pelvic Limb ◽  
Muscular Capacity

Innervation of the Pelvic Limb of the Adult Ostrich (Struthio camelus)

2010 ◽  
pp. no-no ◽  
Author(s):  
T. El-Mahdy ◽  
S. M. El-Nahla ◽  
L. C. Abbott ◽  
S. A. M. Hassan
Keyword(s):  
Struthio Camelus ◽  
Pelvic Limb

scholarly journals Musculoskeletal modeling of an ostrich (Struthio camelus) pelvic limb: Influence of limb orientation on muscular capacity during locomotion

2014 ◽  
Author(s):  
John R Hutchinson ◽  
Jeffery W Rankin ◽  
Jonas Rubenson ◽  
Kate H Rosenbluth ◽  
Robert A Siston ◽  
...  
Keyword(s):  
Muscle Function ◽  
Sagittal Plane ◽  
Dynamic Properties ◽  
Three Dimensional ◽  
Limb Muscle ◽  
Struthio Camelus ◽  
Moment Arms ◽  
Extensor Muscles ◽  
Pelvic Limb ◽  
The Moment

We developed a three-dimensional, biomechanical computer model of the 36 major pelvic limb muscle groups in an ostrich (Struthio camelus) to investigate muscle function in this, the largest of extant birds and model organism for many studies of locomotor mechanics, body size, anatomy and evolution. Combined with experimental data, we use this model to test two main hypotheses. We first query whether ostriches use limb orientations (joint angles) that optimize the moment-generating capacities of their muscles during walking or running. Next, we test whether ostriches use limb orientations at mid-stance that keep their extensor muscles near maximal, and flexor muscles near minimal, moment arms. Our two hypotheses relate to the control priorities that a large bipedal animal might evolve under biomechanical constraints to achieve more effective static weight support. We find that ostriches do not use limb orientations to optimize the moment-generating capacities or moment arms of their muscles. We infer that dynamic properties of muscles or tendons might be better candidates for locomotor optimization. Regardless, general principles explaining why species choose particular joint orientations during locomotion are lacking, raising the question of whether such general principles exist or if clades evolve different patterns (e.g. weighting of muscle force-length or force-velocity properties in selecting postures). This leaves theoretical studies of muscle moment arms estimated for extinct animals at an impasse until studies of extant taxa answer these questions. Finally, we compare our model’s results against those of two prior studies of ostrich limb muscle moment arms, finding general agreement for many muscles. Some flexor and extensor muscles exhibit self-stabilization patterns (posture-dependent switches between flexor/extensor action) that ostriches may use to coordinate their locomotion. However, some conspicuous areas of disagreement in our results illustrate some cautionary principles. Importantly, tendon-travel empirical measurements of muscle moment arms must be carefully designed to preserve 3D muscle geometry lest their accuracy suffer relative to that of anatomically realistic models. The dearth of accurate experimental measurements of 3D moment arms of muscles in birds leaves uncertainty regarding the relative accuracy of different modelling or experimental datasets such as in ostriches. Our model, however, provides a comprehensive set of 3D estimates of muscle actions in ostriches for the first time, emphasizing that avian limb mechanics are highly three-dimensional and complex, and how no muscles act purely in the sagittal plane. A comparative synthesis of experiments and models such as ours could provide powerful synthesis into how anatomy, mechanics and control interact during locomotion and how these interactions evolve. Such a framework could remove obstacles impeding the analysis of muscle function in extinct taxa.

Anatomical Description of the Muscles of the Pelvic Limb in the Ostrich (Struthio camelus)

2004 ◽  
Vol 33 (2) ◽  
pp. 100-114 ◽  
Author(s):  
D. Gangl ◽  
G. E. Weissengruber ◽  
M. Egerbacher ◽  
G. Forstenpointner
Keyword(s):  
Struthio Camelus ◽  
Pelvic Limb

The Arterial Supply of the Pelvic Limb of the Adult Ostrich (Struthio camelus)

2010 ◽  
Vol 39 (4) ◽  
pp. 339-354
Author(s):  
S. M. El-Nahla ◽  
T. El-Mahdy ◽  
L. C. Abbott ◽  
S. A. M. Hassan
Keyword(s):  
Arterial Supply ◽  
Struthio Camelus ◽  
Pelvic Limb

scholarly journals Muscle architecture and functional anatomy of the pelvic limb of the ostrich (Struthio camelus)

2006 ◽  
Vol 209 (6) ◽  
pp. 765-779 ◽  
Author(s):  
N. C. Smith ◽  
A. M. Wilson ◽  
K. J. Jespers ◽  
R. C. Payne
Keyword(s):  
Functional Anatomy ◽  
Muscle Architecture ◽  
Struthio Camelus ◽  
Pelvic Limb

scholarly journals Muscle moment arms of pelvic limb muscles of the ostrich (Struthio camelus)

2007 ◽  
Vol 211 (3) ◽  
pp. 313-324 ◽  
Author(s):  
N. C. Smith ◽  
R. C. Payne ◽  
K. J. Jespers ◽  
A. M. Wilson
Keyword(s):  
Struthio Camelus ◽  
Moment Arms ◽  
Limb Muscles ◽  
Pelvic Limb

scholarly journals Ontogenetic scaling of pelvic limb muscles, tendons and locomotor economy in the ostrich (Struthio camelus)

2019 ◽  
Vol 222 (17) ◽  
pp. jeb182741
Author(s):  
Sarah B. Channon ◽  
Iain S. Young ◽  
Beckie Cordner ◽  
Nicola Swann
Keyword(s):  
Struthio Camelus ◽  
Limb Muscles ◽  
Pelvic Limb
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